Electromagnet that feature is powered bell sound signal to the device.
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diàn líng
A kind of role in the electricity issued under the sound of the bell, can be AC or DC power start; commonly used for signal bell, doorbell, etc.
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No. 3
Bell-shaped flat as the dishes are usually initiated by some kind of electrical device small hammer ring
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No. 4
Using electromagnetic theory, is powered bell sound signal to the device. Mao Dun's "Midnight" Second: "Well, he intended to call the provincial government requested the soldiers call is issued to the bamboo fast look over, go under the wall behind the door bell."
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English Expression
: trembling bell
n.: trembler, trembler bell, gong bell, electric bell